Muscle Loss Raises Kidney Failure Risk 4.5-Fold, Study Finds

Chronic kidney disease patients with reduced muscle mass face a 4.5 times higher risk of kidney function deterioration compared to those with normal muscle mass, according to new research. The study also found that severe protein-energy wasting significantly increases mortality risk by up to 3.8 times.

The Korea Disease Control and Prevention Agency's National Institute of Health released these findings on March 12 to mark World Kidney Day. The research analyzed data from a long-term cohort study of domestic chronic kidney disease patients, conducted in collaboration with Professor Oh Kook-hwan's research team at Seoul National University Hospital.

The analysis of 1,957 pre-dialysis chronic kidney disease patients revealed that those in the lowest muscle mass group had approximately 4.47 times higher risk of kidney function deterioration compared to those in the highest muscle mass group. The actual incidence of kidney function deterioration was 42.5% in the low muscle mass group versus 14.3% in the high muscle mass group—roughly three times higher.

Researchers evaluated patients' muscle mass using a sarcopenia index calculated from blood test markers creatinine and cystatin C. The analysis confirmed that muscle loss is not merely an aging phenomenon but a health indicator closely linked to chronic kidney disease progression. The team noted the index has high clinical applicability as it can simultaneously assess patients' muscle status and kidney disease risk.

A separate analysis of 2,238 non-dialysis chronic kidney disease patients examined the link between protein-energy wasting and mortality risk. Patients with two or more protein-energy wasting indicators showed a 2.78-fold increase in mortality risk, while those with three or more indicators faced up to 3.78 times higher risk.

Notably, this study was the first to confirm that even two protein-energy wasting indicators—below the previous threshold of three—can increase the risk of death and cardiovascular disease.

Researchers explained that chronic kidney disease patients may experience accelerated muscle loss compared to the general population due to chronic inflammation, metabolic abnormalities, and uremic toxin accumulation. Such muscle loss can affect not only physical function but also disease progression.

"This research demonstrates that sarcopenia prevention is not optional but essential for chronic kidney disease patients," said Lim Ju-hyun, Director of the Endocrine and Kidney Disease Research Division at the National Institute of Health. "Maintaining muscle mass through balanced nutrition and exercise is crucial for preventing kidney function deterioration."